US7740945B2 - Brightness enhancement film - Google Patents
Brightness enhancement film Download PDFInfo
- Publication number
- US7740945B2 US7740945B2 US11/544,816 US54481606A US7740945B2 US 7740945 B2 US7740945 B2 US 7740945B2 US 54481606 A US54481606 A US 54481606A US 7740945 B2 US7740945 B2 US 7740945B2
- Authority
- US
- United States
- Prior art keywords
- brightness enhancement
- enhancement film
- resin
- particles
- film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
- G02B5/045—Prism arrays
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133504—Diffusing, scattering, diffracting elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133504—Diffusing, scattering, diffracting elements
- G02F1/133507—Films for enhancing the luminance
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
- Y10T428/12583—Component contains compound of adjacent metal
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
- Y10T428/12583—Component contains compound of adjacent metal
- Y10T428/1259—Oxide
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
- Y10T428/12597—Noncrystalline silica or noncrystalline plural-oxide component [e.g., glass, etc.]
Definitions
- the present invention relates to a brightness enhancement film, and more particularly, to a light-diffusion brightness enhancement film suitable for use in a liquid crystal display (LCD).
- LCD liquid crystal display
- the structure of a liquid crystal display mainly comprises two parts, i.e., a panel and a backlight module, where the panel includes, for example, an indium-tin-oxide (ITO) conductive glass, liquid crystals, an alignment film, a color filter, a polarizer, and a driving integrated circuit, and the backlight module includes, for example, a lamp, a light guide, and various optical films.
- ITO indium-tin-oxide
- the backlight module includes, for example, a lamp, a light guide, and various optical films.
- a brightness enhancement film which is also known as a prism film, has a fine prism structure formed on a polyester optical film having a thickness of only 50-200 ⁇ m by curing a special acrylic resin with a high energy UV light on the polyester optical film.
- the main function of the brightness enhancement film is to collect the disordered light emitted from a light guide to various directions by refraction and total internal reflection, and direct the light to an on-axis direction of about ⁇ 35 degrees, so as to enhance the luminance of the LCD.
- WO 96/23649 filed by 3M Company, discloses a method for preventing the vertex angles of a condensing prism structure from collapsing and sinking, which method comprises heating a completed prism film to a temperature above the glass transition temperature of the resin, so as to increase the hardness of the vertex angles of the condensing prism structure.
- the brightness enhancement film disclosed in WO 96/23649, as shown in FIG. 1 has a condensing structure on only one surface and the other surface is smooth, which cannot effectively diffuse and then condense evenly the light from a light source, and thus results in a poor uniformity of light.
- FIG. 2 is a schematic view of a conventional backlight module for condensing light.
- a diffusion film ( 2 ) is disposed between a light source ( 1 ) and a brightness enhancement film ( 3 ).
- the present invention provides a brightness enhancement film for overcoming the above disadvantages.
- a resin mixed with plastic particles is coated on the back surface of a brightness enhancement film of WO 96/23649, and then, the resin is molded by curing.
- the brightness enhancement film of the present invention the light is uniformized by the resin mixed with plastic particles and then condensed by the prism structure, thereby achieving a better light uniformity.
- the main object of the present invention is to provide a brightness enhancement film, which comprises a substrate with a light diffusion layer having a convex-concave structure on one side of the substrate.
- FIG. 1 is a schematic view of a brightness enhancement film disclosed in WO 96/23649.
- FIG. 2 is a schematic view of a conventional backlight module.
- FIG. 3 is a side view of an embodiment according to the present invention.
- the substrate used in the brightness enhancement film according to the present invention may be any substrate known to those having ordinary skill in the art, such as glass or plastic.
- the above plastic substrate does not require special restrictions, and include, for example, but is not limited to a polyester resin, such as polyethylene terephthalate (PET); a polyacrylate resin, such as polymethyl methacrylate (PMMA); a polyolefin resin, such as polyethylene (PE) or polypropylene (PP); a polyimide resin; a polycarbonate resin; a polyurethane resin; cellulose triacetate (TAC); or a mixture thereof, of which the polyester resin or polycarbonate resin is preferred, and the particularly preferred one is polyethylene terephthalate.
- the suitable thickness of the substrate is usually determined according to the requirements of a desired optical product, which is preferably between about 50 ⁇ m and about 150 ⁇ m.
- the brightness enhancement film according to the present invention may uniformly diffuse and then condense the light from a light source, and thus possesses both the characteristics of a conventional brightness enhancement film and a diffusion film.
- a fine convex-concave structure is formed on the light incidence surface of the substrate as a light diffusion layer, which exhibits a diffusion (Dfs) of between 5% and 90%, preferably between 40% and 90%.
- Dfs diffusion
- the process for forming the light diffusion layer is not particularly limited, and may be any of those well known to those skilled in the art, for example, screen printing, spraying, or embossing.
- a preferred method is to apply a coating layer having a convex-concave microstructure and a thickness of 1 ⁇ m to 50 ⁇ m on the surface of the substrate.
- This coating layer is capable of diffusing light, and comprises particles and a bonding agent, wherein the diameter of the particles ranges from 1 ⁇ m to 100 ⁇ m, preferably from 10 ⁇ m to 50 ⁇ m.
- the shape of the particles which can be, for example, spherical or diamond-shaped.
- the particles which may be organic particles, such as, acrylic resin, styrene resin, urethane resin, and silicone resin, and a mixture thereof; or inorganic particles, such as, zinc oxide, silicon dioxide, titanium dioxide, zirconia, aluminium oxide, zinc sulfide, barium sulfate, or a mixture thereof, or a mixture of both types of particles, of which the organic particles are preferred.
- organic particles such as, acrylic resin, styrene resin, urethane resin, and silicone resin
- inorganic particles such as, zinc oxide, silicon dioxide, titanium dioxide, zirconia, aluminium oxide, zinc sulfide, barium sulfate, or a mixture thereof, or a mixture of both types of particles, of which the organic particles are preferred.
- the suitable bonding agents that can be used in the present invention do not require special limitations, and include, for example, but are not limited to, acrylic resin, polyamide resin, epoxy resin, polyimide resin, or polyester resin.
- the coating layer with the convex-concave microstructure according to the present invention can optionally include a curing agent.
- the curing agent is used in the present invention to form a crosslinking with the bonding agent through the chemical bonding between the molecules, such that molecular chains are crosslinked into a net structure, thereby generating a macro molecule with a strong internal bonding and not easy to be melted.
- the curing agent suitable for the present invention is well known to those skilled in the art, which is, for example, but not limited to polyisocyanate.
- the substrate according to the present invention comprises at least one optical layer as a brightness enhancement layer, which is formed by coating a composition comprising a resin, a photo initiator, and a crosslinking agent on the substrate.
- the suitable resins are well known to those skilled in this art, including for example, but being not limited to a polyester resin, a polyacrylate resin, or a polycarbonate resin.
- the photo initiator suitable for the present invention which is a substance that generates free radicals when being irradiated by light and initiates polymerization through the transfer of the free radicals, and which can be, for example, benzophenone.
- the crosslinking agent suitable for the present invention may be, for example, a (meth)acrylate with one or more functional groups, preferably those with multiple functional groups, so as to raise the glass transition temperature.
- the above brightness enhancement layer may optionally contain additives known to those skilled in the art, which include, for example, but are not limited to, an inorganic filler, a leveling agent, a defoaming agent, and an anti-static agent.
- the brightness enhancement layer of the present invention may be in the form of a planar film or a microstructure, wherein the microstructure is, for example, but not limited to being in the form of a regular or irregular prism pattern, rounded prism pattern, solid angle pattern, bead pattern, or lenticular pattern, of which the prism pattern is preferred as it will provide a better effect on condensing light and thus will enhance the luminance of displays.
- the microstructure is, for example, but not limited to being in the form of a regular or irregular prism pattern, rounded prism pattern, solid angle pattern, bead pattern, or lenticular pattern, of which the prism pattern is preferred as it will provide a better effect on condensing light and thus will enhance the luminance of displays.
- the brightness enhancement film of the present invention can be used in the backlight module of a display.
- the brightness enhancement film of the invention is used for both diffusing light and condensing light, and the light can be uniformly diffused when passing through the film, thereby eliminating the bright and dark stripes and achieving the light uniformity.
- a brightness enhancement film according to the present invention was prepared according to the following method, and the composition used in each example is shown in Table 1.
- the colloidal coating composition was divided to several portions and each portion incorporated 15 weight %, based on the weight of the colloidal coating composition of each portion, of organic particles (J-4P and GR-400T, commercially available from Neagari Company). Thereafter, the mixture was coated onto a BEF II film (a brightness enhancement film commercially available from 3M Company), and the coated film was dried by energy rays to obtain an optical film with a thickness of 40 ⁇ m.
- a BEF II film a brightness enhancement film commercially available from 3M Company
- the coated films thus obtained were subjected to a haze and diffusion test (by NDH 2000 provided by NIPPON DENSHOKU) and a brightness enhancement test (by BM-7® provided by TOPCON Company). The results of the tests are shown in Table 1.
- the brightness enhancement film of the present invention can be used for both diffusing light and condensing light.
Abstract
Description
TABLE 1 | ||||
Brightness | ||||
Haze | Diffusion (Dfs) | |
||
1 | 93 | 7 | 1.55 | ||
2 | 96 | 9 | 1.54 | ||
3 | 97 | 76 | 1.53 | ||
4 | 98 | 80 | 1.50 | ||
Claims (10)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW094135195 | 2005-10-07 | ||
TW94135195A | 2005-10-07 | ||
TW094135195A TWI287115B (en) | 2005-10-07 | 2005-10-07 | Brightness enhancement film |
Publications (2)
Publication Number | Publication Date |
---|---|
US20070082218A1 US20070082218A1 (en) | 2007-04-12 |
US7740945B2 true US7740945B2 (en) | 2010-06-22 |
Family
ID=37945083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/544,816 Active US7740945B2 (en) | 2005-10-07 | 2006-10-06 | Brightness enhancement film |
Country Status (2)
Country | Link |
---|---|
US (1) | US7740945B2 (en) |
TW (1) | TWI287115B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9791769B2 (en) | 2013-10-24 | 2017-10-17 | Xi'an Zhongxing New Software Co.Ltd | Display screen film, preparation method therefor and energy saving method |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7282272B2 (en) * | 2003-09-12 | 2007-10-16 | 3M Innovative Properties Company | Polymerizable compositions comprising nanoparticles |
US7074463B2 (en) * | 2003-09-12 | 2006-07-11 | 3M Innovative Properties Company | Durable optical element |
US20060204676A1 (en) * | 2005-03-11 | 2006-09-14 | Jones Clinton L | Polymerizable composition comprising low molecular weight organic component |
TW200700828A (en) * | 2005-06-20 | 2007-01-01 | Chi Lin Technology Co Ltd | Diffusion brightness enhancement device |
TWI318172B (en) * | 2005-11-23 | 2009-12-11 | Eternal Chemical Co Ltd | Optical thin sheet |
CN101191995A (en) * | 2006-11-27 | 2008-06-04 | 鸿富锦精密工业(深圳)有限公司 | Optical lens test device |
US20090214828A1 (en) * | 2008-02-26 | 2009-08-27 | Vicki Herzl Watkins | Blunt tip prism film and methods for making the same |
CN101887138A (en) * | 2010-06-23 | 2010-11-17 | 上海晶友特种薄膜材料有限公司 | Photoelectric diffusion barrier with full gloss permeability and good photic diffusivity |
CN102778776B (en) * | 2011-05-13 | 2014-12-17 | 苏州汉朗光电有限公司 | Optical coating type smectic phase liquid crystal display |
CN103992724B (en) * | 2014-05-14 | 2016-05-25 | 山东固耐特新材料有限公司 | A kind of antifouling abrasion-proof terrace paint of nano-material modified water-based that uses |
CN108586786A (en) * | 2018-05-04 | 2018-09-28 | 苏州奥美材料科技有限公司 | A kind of makrolon diffusion brightening cured film and preparation method thereof |
TWI679474B (en) * | 2018-10-23 | 2019-12-11 | 友達光電股份有限公司 | Anti-light leakage film assembly and display device using thereof |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060291055A1 (en) * | 2005-06-15 | 2006-12-28 | 3M Innovative Properties Company | Diffuse Multilayer Optical Article |
-
2005
- 2005-10-07 TW TW094135195A patent/TWI287115B/en not_active IP Right Cessation
-
2006
- 2006-10-06 US US11/544,816 patent/US7740945B2/en active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060291055A1 (en) * | 2005-06-15 | 2006-12-28 | 3M Innovative Properties Company | Diffuse Multilayer Optical Article |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9791769B2 (en) | 2013-10-24 | 2017-10-17 | Xi'an Zhongxing New Software Co.Ltd | Display screen film, preparation method therefor and energy saving method |
Also Published As
Publication number | Publication date |
---|---|
US20070082218A1 (en) | 2007-04-12 |
TWI287115B (en) | 2007-09-21 |
TW200714931A (en) | 2007-04-16 |
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Legal Events
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Owner name: ETERNAL CHEMICAL CO., LTD.,TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHUANG, SHIH YI;TSAI, CHAO YI;WU, GUO LONG;REEL/FRAME:018397/0705 Effective date: 20061001 Owner name: ETERNAL CHEMICAL CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHUANG, SHIH YI;TSAI, CHAO YI;WU, GUO LONG;REEL/FRAME:018397/0705 Effective date: 20061001 |
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